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Title: THE SNS RING DIPOLE MAGNETIC FIELD QUALITY.

Abstract

The large acceptance and compact size of the Spallation Neutron Source (SNS) ring implies the use of short, large aperture dipole magnets, with significant end field errors. The SNS will contain 32 such dipoles. We report magnetic field measurements of the first 16 magnets. The end field errors have been successfully compensated by the use of iron bumps. For 1.0 GeV protons, the magnets have been shimmed to meet the 0.01% specification for rms variation of the integral field. At 1.3 GeV, the rms variation is 0.036%. The load on the corrector system at 1.3 GeV will be reduced by the use of sorting.

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab., Upton, NY (US)
Sponsoring Org.:
DOE/SC (US)
OSTI Identifier:
798210
Report Number(s):
BNL-69263
R&D Project: 86401; 39KC0200; TRN: US0203962
DOE Contract Number:
AC02-98CH10886
Resource Type:
Conference
Resource Relation:
Conference: 8TH EUROPEAN PARTICLE ACCELERATOR CONFERENCE, PARIS (FR), 06/03/2002--06/07/2002; Other Information: PBD: 3 Jun 2002
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; APERTURES; DIPOLES; IRON; MAGNETIC FIELDS; MAGNETS; NEUTRON SOURCES; PROTONS; SORTING; SPALLATION; SPECIFICATIONS

Citation Formats

WANDERER,P., JACKSON,J., JAIN,A., LEE,Y.Y., MENG,W., PAPAPHILIPPOU,I., SPATARO,C., TEPIKIAN,S., TSOUPAS,N., and WEI,J. THE SNS RING DIPOLE MAGNETIC FIELD QUALITY.. United States: N. p., 2002. Web.
WANDERER,P., JACKSON,J., JAIN,A., LEE,Y.Y., MENG,W., PAPAPHILIPPOU,I., SPATARO,C., TEPIKIAN,S., TSOUPAS,N., & WEI,J. THE SNS RING DIPOLE MAGNETIC FIELD QUALITY.. United States.
WANDERER,P., JACKSON,J., JAIN,A., LEE,Y.Y., MENG,W., PAPAPHILIPPOU,I., SPATARO,C., TEPIKIAN,S., TSOUPAS,N., and WEI,J. 2002. "THE SNS RING DIPOLE MAGNETIC FIELD QUALITY.". United States. doi:. https://www.osti.gov/servlets/purl/798210.
@article{osti_798210,
title = {THE SNS RING DIPOLE MAGNETIC FIELD QUALITY.},
author = {WANDERER,P. and JACKSON,J. and JAIN,A. and LEE,Y.Y. and MENG,W. and PAPAPHILIPPOU,I. and SPATARO,C. and TEPIKIAN,S. and TSOUPAS,N. and WEI,J.},
abstractNote = {The large acceptance and compact size of the Spallation Neutron Source (SNS) ring implies the use of short, large aperture dipole magnets, with significant end field errors. The SNS will contain 32 such dipoles. We report magnetic field measurements of the first 16 magnets. The end field errors have been successfully compensated by the use of iron bumps. For 1.0 GeV protons, the magnets have been shimmed to meet the 0.01% specification for rms variation of the integral field. At 1.3 GeV, the rms variation is 0.036%. The load on the corrector system at 1.3 GeV will be reduced by the use of sorting.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2002,
month = 6
}

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  • The operating principles and system architecture for a method to measure the magnetic field multipole expansion coefficients are described in the context of the needs of SSC dipole magnets. The operation of an 8-coil prototype system is discussed. Several of the most important technological issues that influence the design are identified and the basis of their resolution is explained. The new features of a 32-coil system presently under construction are described, along with estimates of its requirements for measurement time and data storage capacity.
  • The operating principles and system architecture for a method to measure the magnetic field multipole expansion coefficients are described in the context of the needs of SSC dipole magnets. The operation of an 8-coil prototype system is discussed. Several of the most important technological issues that influence the design are identified and the basis of their resolution is explained. The new features of a 32-coil system presently under construction are described, along with estimates of its requirements for measurement time and data storage capacity.
  • A short Nb{sub 3}Sn dipole model based on a single-bore cos-theta coil with a cold iron yoke has been fabricated and tested recently at Fermilab. Field quality was measured at room temperature during magnet fabrication and at helium temperature. This paper reports the results of cold magnetic measurements. The geometrical harmonics, the coil magnetization effect caused by persistent currents in superconductor and eddy current in the cable, the ''snap-back'' effect at injection are presented and compared with theoretical predictions.
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